/Engine/Source/Editor/UnrealEd/Public/AssetThumbnail.h
Enables/disables realtime thumbnail behavior
void SetRealTimeThumbnail ( const [TSharedPtr](API\Runtime\Core\Templates\TSharedPtr)< [FAssetThumbnail](API\Editor\UnrealEd\FAssetThumbnail) > & Thumbnail, bool bRealTimeThumbnail )